I want more : how to know when I've had enough

Lisa loves gummy bears, especially the yellow and red ones. And the green. And the orange. She would eat a whole bag of them if they didn't make her stomach ache. Emma really enjoys swimming in the bathtub, but she knows exactly when she's been underwater long enough and needs to come up for air. Tim loved the rabbit stuffed animal his grandmother gave him so much that he asked for another, and another, and now Tim isn't quite sure where his favo...